The Evolution of a Convergent Orogen from Upper to Lower Crustal Levels

世界范围内对辐合边缘的研究表明，大陆地壳内部的变形模式因地壳水平和构造环境而异。该项目旨在确定在汇聚过程中中下地壳的相对强度和流变学发生变化的古造山带中，应力是如何从上到下垂直划分的，并将利用新西兰峡湾早白垩世深侵蚀的麻粒岩带。结果应提供古代下地壳应变场的特征和运动学测量，并确定它们如何通过地壳垂直变化，从而解决上、中、下地壳耦合的程度，以及造山过程中强度剖面变化的影响。成功的结果有望适用于广泛的构造

Klepeis0087323Studies of convergent margins worldwide have shown that deformation patterns within continental crust vary according to crustal level and tectonic settings. This project is aimed at determining how strain was partitioned vertically from upper to lower levels of an ancient orogen where the relative strengths and rheology of the middle and lower crust changed during convergence, and will utilize a deeply eroded, early Cretaceous granulite belt in Fiordland, New Zealand. Results should provide a measure of the characteristics and kinematics of ancient lower crustal strain fields and determine how they changed vertically through the crust, thereby addressing the extent to which the upper, middle and lower crust were coupled, and the effects of a changing strength profile as orogenesis proceeded. Successful results are expected to be applicable to a wide range of tectonic